Senior Fullstack Engineer - Java/React & Architecture

Commerzbank AG; Łódź; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Development plans

Life insurance

Flexible working hours

Team integration events

Job summary

Commerzbank AG in Łódź invites a Specialist Fullstack Developer to join the FlexHub team. You will design and implement scalable full-stack modules using Java and React, define interfaces, and help ensure data consistency across distributed systems.

You will mentor teammates, contribute to ADRs, support product management on technical feasibility, and drive continuous improvement with new tools and practices. Fluency in English and Polish (B2+) is required.

Qualifications

• Hands-on experience with Java and React.
• Experience with RESTful Web Services.
• Good knowledge of SQL, HTML5, and Git.
• Experience with unit testing.
• Good understanding of object-oriented design principles.
• Experience working with Agile methodologies.
• Fluency in English and Polish, both at a minimum B2 level.

Responsibilities

• Design and develop critical full-stack modules capable of handling high transaction volumes.
• Define interface contracts and ensure data consistency across distributed systems.
• Solve complex technical challenges, including concurrency and memory management issues.
• Define testing strategies and ensure adherence to security and development best practices.
• Support the team during technical planning and help resolve technical blockers.
• Analyse production metrics to identify bottlenecks and support capacity planning.
• Document key architectural decisions using ADRs.
• Mentor and support developers, helping them grow their technical skills and advance their careers.
• Advise Product Management on the technical feasibility, complexity, and risks of new features.
• Drive continuous improvement by introducing tools, frameworks, and practices that increase developer productivity and software quality.

Skills

Java

React

RESTful Web Services

SQL

HTML5

Git

Unit testing

OO design

Agile methodologies

English (B2+)

Polish (B2+)

Job description

Commerzbank AG in Łódź invites a Specialist Fullstack Developer to join the FlexHub team. You will design and implement scalable full-stack modules using Java and React, define interfaces, and help ensure data consistency across distributed systems.

You will mentor teammates, contribute to ADRs, support product management on technical feasibility, and drive continuous improvement with new tools and practices. Fluency in English and Polish (B2+) is required.